Pulling-rope-free roller shutter and resistance mechanism thereof

Abstract

The utility model relates to a rope-free roller shutter and a resistance mechanism thereof, the resistance mechanism is suitable for being mounted between a rolling bar and a fixed seat of the rope-free roller shutter, and the resistance mechanism comprises a shell seat fixedly mounted on the rolling bar and a resistance module mounted on the shell seat. And a latch structure is arranged on the inner circumferential surface of the shell seat. The resistance module comprises a shaft rod arranged on the shell base in a penetrating mode and a plurality of gears installed on the shaft rod. And the shaft rod is inserted and fixed on the fixed seat. And the gear can be driven by the rotation of the latch structure of the shell seat so as to rotate relative to the shaft rod. Through the structural design of the shell seat of the resistance mechanism and the resistance module, the static friction force between the shell seat and the resistance module can become the resistance when the rolling strip rotates, and the problem that the curtain cloth cannot be stopped at any time due to improper counterweight design of an existing pull rope-free roller blind can be solved indeed.

Description

Technical Field

[0001] The utility model relates to a rolling curtain, in particular to a rope-free rolling curtain and a resistance mechanism thereof. Background Art

[0002] See also Figure 1 , 2 3. The rope-free roller blind disclosed in Taiwan Patent Certificate No. I542307 comprises a fixing seat 11 and a hanging seat 12 which are arranged on the wall at intervals on the left and right sides, a rolling unit 13 installed on the hanging seat 12, and a roller blind unit 14 arranged between the fixing seat 11 and the rolling unit 13.

[0003] The retracting unit 13 includes a housing 131 and a retracting assembly 132 disposed inside the housing 131. The retracting assembly 132 includes a first gear 133 and a second gear 134 rotatably mounted in the housing 131 and meshing with each other, and a retracting spring 135 retracted between the first gear 133 and the second gear 134.

[0004] The rolling unit 14 includes a rolling bar 141, a curtain 142 that can be rolled up and down on the rolling bar 141, and a weight 143 disposed at the end of the curtain 142. The rolling bar 141 has a linkage portion 144 that is rotatably inserted into the housing 131 and is non-rotatably inserted into the first gear 133, and a mounting portion 145 that is rotatably inserted into the fixing seat 11.

[0005] By utilizing the retracting elastic force of the retracting spring sheet 135 and the counterweight design of the counterweight member 143 , the rolling curtain unit 14 can maintain balance without a pull cord, so that the curtain 142 can be pushed up or pulled down to stop at any position.

[0006] However, in order to accurately position the curtain 142 at the position where pushing and pulling stops, the counterweight 143 must be accurately configured with a small allowable error based on the weight of the curtain 142 and the retracting elastic force of the retracting spring 135. Once the counterweight error of the counterweight 143 is slightly large, it is easy for the retracting unit 13 to fail to immediately stop the curtain 142 after stopping pushing up or pulling down the curtain 142. Summary of the invention

[0007] An object of the present invention is to provide a resistance mechanism for a cordless roller blind that can overcome at least one disadvantage of the background art.

[0008] The resistance mechanism for a cordless roller blind of the utility model is suitable for being installed between a rolling bar and a fixed seat of the cordless roller blind. The resistance mechanism comprises a shell seat for being installed on the rolling bar in a non-rotatable manner, and a resistance module installed on the shell seat and connected to the fixed seat. The shell seat comprises a hollow tube wall in the left and right axial directions, and an end wall connected to one end of the tube wall. The inner circumference of the tube wall is provided with a latching structure distributed along its circumference, and the resistance module comprises a shaft rod rotatably penetrated through the end wall and coaxially inserted in the tube wall, and a plurality of gears rotatably installed on the shaft rod in the left and right axial directions. The shaft rod is non-rotatably inserted in the fixed seat. The gears are distributed at intervals along the circumference of the shaft rod and mesh with the latching structure, and the gears can be rotated relative to the shaft rod by the rotation transmission of the latching structure of the tube wall.

[0009] The resistance mechanism for a cordless roller blind described in the utility model comprises: an axial rod having a fixed section which is rotatably and coaxially penetrates the end wall and is used to be inserted and fixed on the fixed seat, and a mounting section which is coaxially connected to one end of the fixed section and is located in the tube wall, the mounting section having a first mounting wall and a second mounting wall which are spaced apart from each other on the left and right, and the gear is pivotally connected between the first mounting wall and the second mounting wall so as to be relatively rotatable.

[0010] The resistance mechanism for the rope-free roller blind described in the utility model, the mounting section also has a plurality of accommodating grooves recessed on its outer circumference and between the first mounting wall and the second mounting wall, and the gears are respectively embedded in the accommodating grooves.

[0011] The resistance mechanism for a cordless roller blind described in the utility model is that the first mounting wall has a plurality of first pivot grooves which are axially penetrated and recessed in its outer peripheral surface and distributed along its periphery; each gear has a gear portion which is between the first mounting wall and the second mounting wall and meshes with the latching tooth structure; a first pivot portion which can rotate relatively left and right and penetrate the corresponding first pivot groove; and a stop portion which is expanded in diameter relative to the first pivot portion and is limitedly pressed against the side of the first mounting wall which is away from the gear portion; the first mounting wall also has a plurality of limit stop portions which protrude into the first pivot groove and respectively limit the first pivot portion in the first pivot groove so that it can be radially disengaged.

[0012] The resistance mechanism for the cordless roller blind described in the utility model has a second mounting wall with a plurality of second pivot grooves axially penetrating the outer peripheral surface and spaced apart along the periphery thereof, and each gear also has a second pivot portion radially embedded in the corresponding second pivot groove and capable of relative rotation.

[0013] In the resistance mechanism for the rope-free rolling curtain of the utility model, the gear part of each gear is in a shape extending in the left and right longitudinal directions.

[0014] The resistance mechanism for a cordless roller blind described in the utility model has an end wall with an inner side surface facing the tube wall and an outer side surface facing away from the tube wall, the mounting section of the shaft rod is limited and abutted against the inner side surface of the end wall, the fixed section has a rotating shaft portion rotatably passed through the end wall, and an insertion portion coaxially protruding outward from the rotating shaft portion and used for being inserted and fixed to the fixing seat, the outer circumferential surface of the rotating shaft portion is recessed with an embedding groove, and the resistance module also includes a limiting member embedded in the embedding groove and limited and abutted against the outer side surface of the end wall.

[0015] The resistance mechanism for the rope-free roller blind described in the utility model is characterized in that a first anti-rotation structure is arranged on the inner circumference of the rolling strip, the tube wall is coaxially inserted in the rolling strip, and a second anti-rotation structure is arranged on the outer circumference of the tube wall for being connected to the first anti-rotation structure in a non-rotatable manner.

[0016] The resistance mechanism for the rope-free roller blind described in the utility model comprises a first anti-rotation structure of the rolling strip which is a plurality of grooves spaced apart around its axis and extending axially, and a second anti-rotation structure of the tube wall which has a plurality of radially outwardly protruding ribs which are respectively embedded and positioned in the grooves.

[0017] Another object of the present invention is to provide a cord-free roller blind that can overcome at least one disadvantage of the background art.

[0018] The utility model of a pull-cord-free roller blind comprises a fixed seat and a hanging seat for being installed on the wall surface at intervals on the left and right, and a roller blind mechanism. The roller blind mechanism comprises a rolling bar extending left and right and between the fixed seat and the hanging seat, a curtain cloth wound outside the rolling bar, a reeling unit installed between the hanging seat and one end of the rolling bar, a counterweight installed at the end of the curtain cloth, and the resistance mechanism as described above. The reeling unit always has a reeling elastic force that drives the rolling bar to rotate and reel the curtain cloth upward. The counterweight has a gravity that matches the reeling elastic force. The resistance mechanism is installed between the other end of the rolling bar and the fixed seat.

[0019] The beneficial effect of the utility model is that through the structural design of the shell seat and the resistance module of the resistance mechanism, the static friction between the shell seat and the resistance module will become the resistance when the rolling bar rotates, which can indeed improve the problem that the existing rope-free roller blinds are prone to being unable to stop due to improper counterweight design. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0021] Figure 1 It is an incomplete three-dimensional diagram, illustrating the structure of the pull-cordless roller blind of the background art Taiwan Patent No. I542307;

[0022] Figure 2 is an incomplete front view illustrating the roller blind structure of the background technology;

[0023] Figure 3 is a side view illustrating the internal structure of the reel-up unit of the background art;

[0024] Figure 4 It is an incomplete three-dimensional diagram illustrating the structure of an embodiment of the pull-cord-free roller blind of the utility model;

[0025] Figure 5 is an incomplete side sectional view illustrating the local structure of this embodiment;

[0026] Figure 6 is a three-dimensional diagram illustrating the structure of the resistance mechanism of this embodiment;

[0027] Figure 7 is a three-dimensional exploded sectional view illustrating the structure of the resistance mechanism of the embodiment;

[0028] Figure 8 is a left side cross-sectional view illustrating the structure of the resistance mechanism of the embodiment;

[0029] Fig. 9 It is an incomplete enlarged left sectional view, illustrating the installation structure of a gear and a mounting section of a shaft rod. DETAILED DESCRIPTION

[0030] See also Figure 4 , 5 An embodiment of the cordless rolling curtain of the utility model is suitable for installation on a wall (not shown). The cordless rolling curtain comprises a fixing seat 2 and a hanging seat 3 for installation on the wall at intervals on the left and right, a rolling curtain mechanism 4 arranged between the fixing seat 2 and the hanging seat 3 and connected to the hanging seat 3, and a resistance mechanism 5 installed between the rolling curtain mechanism 4 and the fixing seat 2. Since the fixing seat 2 and the hanging seat 3 are both existing components and are not the focus of improvement of the utility model, they will not be described in detail.

[0031] The rolling mechanism 4 includes a rolling bar 41 extending left and right and between the fixed seat 2 and the hanging seat 3, a curtain 42 wound outside the rolling bar 41, a counterweight 43 arranged at the end of the vertical swing of the curtain 42, and a reeling unit 44 installed at one end of the rolling bar 41 and installed on the hanging seat 3. The reeling unit 44 has a reeling elastic force that constantly drives the rolling bar 41 to reel the curtain 42 upward. The counterweight 43 has a gravity applied to the curtain 42 and matched with the reeling elastic force. A first anti-rotation structure 411 is provided on the inner circumference of the section of the rolling bar 41 adjacent to the fixed seat 2. In this embodiment, the first anti-rotation structure 411 has a plurality of grooves 412 extending axially and distributed at intervals along the circumference of the inner circumference.

[0032] The curtain 42 can be pushed and pulled up and down and stopped by the structural design of the rolling curtain mechanism 4. Since the rolling curtain mechanism 4 is a component of the existing non-pull cord rolling curtain and is not the focus of the improvement of the present utility model, it will not be described in detail.

[0033] See also Figures 5 to 8 The resistance mechanism 5 includes a shell seat 6 which is non-rotatably inserted and fixed in the end of the rolling bar 41 adjacent to the fixed seat 2, and a resistance module 7 which is installed in the shell seat 6 and non-rotatably connected to the fixed seat 2.

[0034] The housing 6 has a hollow tubular wall 61 extending axially from side to side and inserted into the end of the rolling strip 41, and an end wall 62 connected to one end of the wall 61 and limitedly pressed against the end surface of the rolling strip 41. The inner circumference of the wall 61 is provided with a tooth structure 611 extending in a ring shape along its circumference, and the outer circumference of the wall 61 is provided with a second anti-rotation structure 612 distributed along its circumference.

[0035] In this embodiment, the second anti-rotation structure 612 is a plurality of axially extending and radially outwardly protruding ribs 613, and the ribs 613 are respectively embedded in the grooves 412 of the first anti-rotation structure 411. The housing 6 is inserted and fixed in the rolling bar 41 in a non-rotatable manner through the connection between the second anti-rotation structure 612 and the first anti-rotation structure 411.

[0036] The end wall 62 has an inner side surface 621 facing the inner side surface 621 and an outer side surface 622 facing away from the inner side surface 621 , and has a pivot hole 623 penetrating the inner side surface 621 and the outer side surface 622 .

[0037] The resistance module 7 includes a shaft 8 that is relatively rotatable and passes through the end wall 62 from side to side and is coaxially arranged in the tube wall 61, three gears 91 that are distributed along the circumference of the shaft 8 and are relatively rotatable and installed on the shaft 8, and a stopper 92 that is installed on the shaft 8 and limits the shaft 8 to the end wall 62. The gear 91 is relatively rotatably engaged with the tooth structure 611 of the tube wall 61.

[0038] The shaft 8 has a fixed section 81 extending left and right and coaxially passing through the pivot hole 623 of the end wall 62, and a mounting section 82 coaxially connected to the fixed section 81 and located in the tube wall 61. The fixed section 81 has a rotating shaft portion 811 passing through the pivot hole 623 and being relatively rotatable, and an inserting portion 813 coaxially protruding outward from the rotating shaft portion 811 and being non-rotatably inserted into the fixing seat 2. The outer circumferential surface of the rotating shaft portion 811 is concavely provided with an inserting groove 812 located outside the end wall 62 and adjacent to the outer side surface 622.

[0039] The mounting section 82 has a central axis 821 coaxially connected to one end of the rotating shaft portion 811, and a first mounting wall 823 and a second mounting wall 828 radially extending outward from both ends of the central axis 821 at intervals. The outer peripheral surface of the central axis 821 is concavely provided with three accommodating grooves 822 extending left and right and distributed along its periphery. The first mounting wall 823 is relatively far away from the end wall 62, and the second mounting wall 828 is limited to abut against the inner side surface 621 of the end wall 62.

[0040] See also Figure 7 , 9 The first mounting wall 823 has three axially penetrating recessed portions on its outer circumference and respectively connected to the first pivoting grooves 824 of the receiving groove 822, and the first mounting wall 823 also has six position-limiting stoppers 827 that respectively protrude into the receiving groove 822 in pairs, and the two position-limiting stoppers 827 in pairs separate the corresponding first pivoting groove 824 into an embedding groove section 825 and a position-limiting groove section 826 that are sequentially connected radially inward. The second mounting wall 828 has three axially penetrating recessed portions on its outer circumference and respectively connected to the second pivoting grooves 829 of the receiving groove 822.

[0041] The gears 91 are pivotally connected between the first mounting wall 823 and the second mounting wall 828 so as to be relatively rotatable, and are respectively embedded in the receiving grooves 822. Each gear 91 has a gear portion 911 extending leftward and rightward, a first pivot portion 912 extending outwardly from one end of the gear portion 911 adjacent to the first mounting wall 823, a stop portion 913 with a diameter expansion protruding at the end of the extension of the first pivot portion 912, and a second pivot portion 914 protruding outwardly from one end of the gear portion 911 adjacent to the second mounting wall 828.

[0042] See also Figure 5 , 7 9, when each gear 91 is installed on the mounting section 82 of the shaft 8, the first pivot portion 912 is inserted downward into the insertion slot section 825 of the first pivot groove 824 across the first mounting wall 823, and the first pivot portion 912 is pressed downward through the corresponding limit stop portion 827, and is rotatably inserted into the limit groove section 826. At this time, the first pivot portion 912 is limited in the limit groove section 826 by the limit stop portion 827, the stop portion 913 and the gear portion 911 are respectively limited and pressed against the two opposite sides of the first mounting wall 823, the second pivot portion 914 is rotatably inserted downward into the corresponding second pivot groove 829, and the gear portion 911 is rotatably inserted into the corresponding receiving groove 822.

[0043] The limiting member 92 is a C-shaped buckle, which is clamped in the locking groove 812 of the rotating shaft 811 and is limitedly pressed against the outer side surface 622 of the end wall 62, thereby preventing the shaft 8 from being displaced left and right relative to the housing 6. Since there are many types of the limiting member 92, the implementation is not limited to the embodiment of the present invention.

[0044] See also Figure 4 , 8 When the pull-cord-free roller blind of the utility model is used, static friction will exist in the meshing structure between the tube wall 61 of the shell seat 6 and the gear 91 of the resistance module 7 .

[0045] Since the housing seat 6 is mounted on the rolling bar 41, and the shaft 8 of the resistance module 7 is non-rotatably mounted on the fixing seat 2, the static friction between the resistance module 7 and the housing seat 6 will also act on the rolling bar 41 at the same time, and become a rotation resistance to prevent the rolling bar 41 from rotating. Therefore, when the unfolded length of the curtain 42 is to be adjusted and the curtain 42 is pushed and pulled up and down, the curtain 42 must first be made to overcome the static friction between the resistance module 7 and the housing seat 6, so that the rolling bar 41 can be driven to rotate to adjust the unfolded length of the curtain 42. When the application of force to push and pull the curtain 42 stops, the gravity of the counterweight 43 and the retracting elastic force of the retracting unit 44, together with the rotation resistance of the static friction applied to the rolling bar 41, will drive the rolling bar 41 to stop rotating immediately, and then the curtain 42 stops at the position where the pushing and pulling stops.

[0046] In summary, through the structural design of the housing seat 6 of the resistance mechanism 5 and the resistance module 7, the static friction between the housing seat 6 and the resistance module 7 will become the resistance when the rolling bar 41 rotates, so when there is a slightly larger error in the counterweight design of the counterweight member 43, the curtain 42 can still be stopped at the position where the push-pull stops, and the problem that the curtain cannot stop due to improper counterweight design in the existing non-pull cord type rolling curtain can be improved. Therefore, the non-pull cord type rolling curtain of the utility model is indeed a very innovative and convenient and practical creation, and can indeed achieve the purpose of the utility model.

[0047] The above is only an embodiment of the present invention and should not be used to limit the scope of the present invention. All simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the present invention.

Claims

1. A resistance mechanism for a cordless roller blind, suitable for being installed between a rolling bar and a fixing seat of the cordless roller blind, characterized in that: The resistance mechanism includes a shell seat for being mounted on the rolling bar in a non-rotatable manner, and a resistance module mounted on the shell seat and connected to the fixed seat, the shell seat includes a hollow tube wall in the left and right axial directions, and an end wall connected to one end of the tube wall, the inner circumferential surface of the tube wall is provided with a latching structure distributed along its circumference, the resistance module includes a shaft rod rotatably passed through the end wall and coaxially inserted in the tube wall, and a plurality of gears mounted on the shaft rod in the left and right axial directions in a relatively rotatable manner, the shaft rod is non-rotatably inserted in the fixed seat, the gears are distributed at intervals along the circumference of the shaft rod and mesh with the latching structure, and the gears can be driven by the rotation of the latching structure of the tube wall and rotate relative to the shaft rod.

2. The resistance mechanism for a cordless roller blind according to claim 1, characterized in that: The shaft rod has a fixed section that is rotatably and coaxially penetrates the end wall and is used to be inserted and fixed on the fixed seat, and a mounting section that is coaxially connected to one end of the fixed section and is located in the tube wall. The mounting section has a first mounting wall and a second mounting wall that are spaced apart from each other on the left and right, and the gear is pivotally connected between the first mounting wall and the second mounting wall so as to be relatively rotatable.

3. The resistance mechanism for a cordless roller blind according to claim 2, characterized in that: The mounting section also has a plurality of accommodating grooves which are recessed on its outer peripheral surface and located between the first mounting wall and the second mounting wall, and the gears are respectively embedded in the accommodating grooves.

4. The resistance mechanism for a cordless roller blind according to claim 3, characterized in that: The first mounting wall has a plurality of first pivot grooves which are axially penetrated and recessed in its outer peripheral surface and distributed along its periphery. Each gear has a gear portion which is located between the first mounting wall and the second mounting wall and meshes with the latching tooth structure, a first pivot portion which can rotate left and right and penetrate the corresponding first pivot groove, and a stop portion which is expanded in diameter relative to the first pivot portion and is limitedly pressed against the side of the first mounting wall which is away from the gear portion. The first mounting wall also has a plurality of limit stop portions which protrude into the first pivot groove and respectively limit the first pivot portion in the first pivot groove so that it can be radially disengaged.

5. The resistance mechanism for a cordless roller blind according to claim 4, characterized in that: The second mounting wall has a plurality of second pivot grooves which are axially penetrated and recessed in the outer peripheral surface and spaced apart along the periphery thereof. Each gear also has a second pivot portion which is radially embedded in the corresponding second pivot groove and can rotate relatively.

6. The resistance mechanism for a cordless roller blind according to claim 4, characterized in that: The gear portion of each gear is in a shape extending in the left-right longitudinal direction.

7. The resistance mechanism for a cordless roller blind according to claim 2, characterized in that: The end wall has an inner side surface facing the tube wall and an outer side surface facing away from the tube wall, the mounting section of the shaft rod is limited and abutted against the inner side surface of the end wall, the fixed section has a rotating shaft portion rotatably passed through the end wall, and an insertion portion coaxially protruding outward from the rotating shaft portion and used for being inserted and fixed to the fixing seat, an embedding groove is recessed on the outer peripheral surface of the rotating shaft portion, and the resistance module also includes a limiting member embedded in the embedding groove and limited and abutted against the outer side surface of the end wall.

8. The resistance mechanism for a cordless roller blind according to claim 1, characterized in that: The inner circumference of the rolling bar is provided with a first anti-rotation structure, the tube wall is coaxially inserted in the rolling bar, and the outer circumference of the tube wall is provided with a second anti-rotation structure for being connected to the first anti-rotation structure in a non-rotatable manner.

9. The resistance mechanism for a cordless roller blind according to claim 8, characterized in that: The first anti-rotation structure of the rolling strip is a plurality of grooves spaced apart around its axis and extending axially, and the second anti-rotation structure of the tube wall has a plurality of radially outwardly protruding ribs respectively embedded and positioned in the grooves.

10. A cordless rolling curtain, suitable for installation on a wall, the cordless rolling curtain comprises a fixing seat and a hanging seat for being installed on the wall at intervals on the left and right, and a rolling curtain mechanism, the rolling curtain mechanism comprises a rolling bar extending left and right and between the fixing seat and the hanging seat, a curtain cloth wound outside the rolling bar, a reeling unit installed between the hanging seat and one end of the rolling bar, and a counterweight installed at the end of the curtain cloth, the reeling unit always has a reeling elastic force for driving the rolling bar to rotate and reel the curtain cloth upward, the counterweight has a gravity matching the reeling elastic force, and is characterized in that: The pull-cordless roller blind further comprises a resistance mechanism as claimed in any one of claims 1 to 9, wherein the resistance mechanism is installed between the other end of the rolling strip and the fixing seat.

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